\documentclass{article}
\usepackage{amssymb,amsmath,amscd,concmath}
\pagestyle{empty}
\begin{document}
\begin{equation*}s^2 t^2 + s^2 |u|^2 + t^2 |v|^2 + |v|^2 |u|^2 (cos^2 x + sin^2 x) + s u \cdot  (v \times u) + t v \cdot  (v \times u) + s u \cdot  (v \times u) + t v \cdot  (v \times u)  =\end{equation*}
\end{document}
